Machine for making containers from pulpy fibrous material



Aug. 17, 1948. H, R. DENToN MACHINE FOR MAKING CONTAINERS FROM PULPYFIBRous MATERIAL 5 Sheets-Sheet l' Filed Feb. 20, 1945 214 zas- Aug. 17,1948. H, R. DENToN I MACHINE Foa MAKING coMfrAIuEns FRoM PULPY FIBRousMATERIAL Filed Feb. 2o, 1945 m. T m m Arran/Veys.

5 Sheets-Sheet 3 INVENTOR.

.eA/evs.

H; R. DENTON MACHINE FOR MAKING CONTAINERS FROM PULPY FIBROUS MATERIALAug. 17, 194s.

Fi 1ed Feb. 20, 1945 Mam/Ey l?. DE/vra/v BY ik cd 0o al H. R. DEN'I'CN;MACHINE FOR MAKING CONTAINERS Aug. 1-7, 1948.

FROM PULPY FIBROUS MATERIAL 5 Sheets-Sheet 4 Filed Feb. 20, 1945JNVENTOR. HH@ vey l?, pE/vra/v Hive/@VE vs,

H. R. DENTON MACHINE FOR MAKING CONTAINERS Aug. 17, 194s.

FROM PULPY FIBROUS MATERIAL 5 Sheets-Sheet 5 Filed Feb. 20, 1945INVENTOR. #4m/Ev l? 05N ro/v BY y W, m61 9 Arra/PNE'VS,

I 'by a chain I3. One or more air inlet tubes I4 are also carried byhead I, which tubes are each connected within thel head with a iiexibleair line I5 for a purpose later to be described in connection with thepiston I0 and a high pressure 'water inlet I6 connected with a highpressure water line -I1 opens into the upper end of cylinder 2 throughhead I.

Cylinder 2 is coaxial with head I and is secured thereto in any suitablemanner. Around the lower end of said cylinder is a passageway I8 thatopens int-o the cylinder at a point very close to its lower end throughslots I6 that are around the sides of the cylinder-like segments of anannular slot (Figs. 8, 13) This passageway is for the admission of pulpybrous material below the piston I 0, although at its lowest point in thecylinder 2, the said piston extends over the slot-s I9 closing them. Oneor more inlets 20 open into the passageway I8 for admitting said pulpinto the same, and a conduit 2I conducts such pulp to each such inletfrom a source of supply (Fig. l).

The piston I0 that is within cylinder 2 has a head 22 at its lower endand a skirt extend-ing upwardly from said head carries a seal-ing ringor 1 rings 23.

The head 22 of this piston provided with four rectangular aperturesarranged in two pairs at opposite sides of the central axis of thepiston, in each of which is secured a depending elastic mold core 26that may be of any elastic material that is impervious to water and thatis relatively strong (Figs. 5, 6, 8). Theview in Fig. 5 is slightlyturned on the axis `of the piston relative to the viewof Fig. 6 inasmuchas this is actual relation of the opening to the axis of the machineillustrated in Fig. 1 in which the guide bars 9 are in a vertical planeperpendicular to the line of vision. The view of Fig. 6 is slightlyturned relative to that of Fig. 5 so that the cores will be seen insymmetrical arrangement with respect to the observer.

The cores 26 open at their upper ends into the i area within cylinder 2above the piston and piston head 22, and said cores may be clamped inany suitable manner, as by frames 21 (Fig. 5) to the head 22.

4Between the ,cores of each Vpair isa rigid tube 28. Each tube 28 iscarried by head 22 at its upper end and said upper end also connectswith the flexible air line I5. The lower end of each tube is closed, butthe sides may be apertured at 29 for -discharge of air. Said aperturesare preferably covered by an annular elastic band 3l),l v therebyproviding a check valve at said lower end 32 in the lower end of thecylinder- The piston I2 is connected to the chain I3 by a piston rod 33that may extend through stop 32 and a suitable packing gland at thejuncture between the cylinder II and head I.

The mold jacket 3 is coaxial with cylinder 2 and is secured to thelatter by any conventional means such as bolts. The said jacket iscircular in cross section, except for external projections such as lugs35 for standards 4. It is not truly cylindricall however, but is formedwith a plurality of superposed downwardly and outwardly inclinedsections in which the smaller upper ends of each section are joined tothe larger diameter lower end of the upper section by an annular flange36 (Figs. 8, 10). Thus there is an upwardly facing shoulder 31 withinthe mold jacket at the juncture between each pair of adjacent sections.

The lower end of the mold jacket 3 is provided internally withinterrupted threads 38 (Fig. 10). These threads are adapted to beengaged by similar, :but external threads 39 on an annular locking ring39 that is rotatably secured onto the upper end of the pressure plate 5.

Within the mold jacket 3 are four hollow members that have outer walls40, 4I, 42, 43 (Fig. 6) that are slidable up and down against theslanted inner sides of the sections forming the sides of the moldjacket. These outer walls have sections formed like the sections of themold jacket, and flanges 44 connect adjacent pairs of such sections(Fig, 8) thus providing external downwardly facing shoulders 45 at thejunctures between sections, which shoulders are in opposed relation toshoulders 31 on the mold jacket.

The external contour of the four outer walls 40 to 43 corresponds withcurve of the circular contour of the mold jacket. However, spaced fromthe inwardly facing sides of Walls 40, 42, which pair are generallyopposed to each other, are parallel flat plates 46, 48 that areintegrally connected with walls 40, 42 respectively (Fig. 6). And spacedinwardly of walls 4I, 43 are parallel flat plates 45, 41 that areintegral with walls 4I, 43 respectively. Plates 46, 48 are shorter thanplates 45, 41 and are slidable toward and away from each other betweenthe ends of plates 45, 41. The upper end of each flat inner wall of eachof the four hollow members is connected integrally with the curved outerplate adjacent thereto by a flat horizontal wall 50 (Fig. 8), and eachwall 50 is adapted to extend over and to engage the flat downwardlyfacing surface 5I of the lower end of cylinder 2 when the hollow membersare at the top of their movement 4against the inner inclined sides ofthe mold jacket.

When said hollow members are at the upper ends of their movement andwalls 5D engage surfaces 5I, the opposed shoulder surfaces 31, 45' onthe hollow members and mold jacket are spaced a substantial distanceapart, and the flat inner plates 45, 41 and 46, 48 are at their minimumdistances from each other. Arly downward movement of the hollow membersagainst the inner` inclined sides of the mold jacket will result in saidplates 45, 41 and 46, 48 moving apart.

The walls 40 to 43 of the hollow members are held against the innersurfaces of the mold jacket by rollers 53 (Figs. 6, 8), A pair of theserollers is carried by each of the walls 40, 44 by posts 54 that extendthrough a slot 58 in the wall jacket adjacent each of said walls. Theposts 54 for each pair of rollers carries a bearing 55 on which eachpair of rollers 53 is supported. and a spring 56 yieldably urges eachbearing inwardly. As the rollers run on the outer sides of the moldjacket at :opposite sides of each slot 55 the walls 40 to 44 areyieldably held in contact with the inner sides of the mold jacket at auniform pressure at all times during sliding of said walls upwardly anddownwardly against Isidfouterides. f what ares-respectivelyoperatedby-eameInI-wroa .T. "Ehe: centrali hollow/'aman -r'l'iahasameroratedinclusive These are indicated in Fig. .lsand 7 -I I and a dischargeconduit |I6 connects with one end of chamber III (Fig. l)

Referring back to Fig. 3, the high pressure valve of each pair of valvesfor each cam is indicated at ||1 in closed position. This valve isclosed by a spring II8'against port IIS, which A port-communicates inturn with passageway |20 extends through a packing box |22 to outsidethe housing |00 where it is adapted to be engaged by one end of a rockerarm |23. Rocker arm |23 is rotatably supported on a shaft |24 forrocking thereon, the said shaft being parallel with housing |00.

Each discharge valve is as indicated at |25 (Fig 3) and each is spacedWithin a hollow ex- -tension |26 on one side of housing |00. Apassageway |21 communicates with the interior of the extension |26 and aport |28 communicates between the interior of said extension and thedischarge chamber III. Valve |25 is yieldably urged toward a positionclosing port |28 by a spring |29 in said extension. The valve rod |30 onwhich valve |25 is carried extends through a stuiilng box for engagementby the end of rocker arm |23 that is opposite the one that engages rodI2I.

l A spring |32 is preferably interposed between each end of the rockerarm and each valve rod.

The rocker arm carries a cam follower |33 at its end that is over valverod I2I, and which follower is held at all times in yieldable engagementwith each cam that is adjacent thereto by means of a spring |34 thatconnects the opposite end of the rocker arm with the housing.

Each cam, like cam |0I, has a high portion or surface |35 and a lowsurface |36, and the cams are all secured on cam shaft |31, When thefollower |33 of each cam is on the low surface |36 @of said cam, thedischarge valve is opened under the influence of spring |34 and the highpressure valve ||1 is closed. When the cam follower is on the highsurface |35 the discharge valve |25 is closed and the high pressurevalve I|1 is opened.

The cam shaft |31 carries a sprocket |38 that is revolvable thereon, andrigid with said sprocket is a disk |39 (Fig. 4). Sprocket |38 isconnected by chain |40 with a motor (not shown) for revolving disk |39at the desired speed in a clockwise direction as seen in Fig. 4.

An arm |4I is secured rigidly on shaft |31 and which arm has a dog |42piovtally secured to its outer end, said dog being adapted to swing intoa recess |43 formed in disk |39 whereby the cam shaft |31 will be lockedto the sprocket |38 for driving by the latter as long as dog |42 is inrecess |43, but if the dog is swung out of the recess |43, then thesprocket will continue to revolve, but the shaft |31 will remainstationary.

As before stated, each of the chambers ||2 of the control means may beconnected by a pipe or conduit with the particular hydraulicallyactuatable means to be actuated as will now be explained, together withthe several means to be actu-ated.

With the apparatus ready to commence a cycle of operation, the cam |0|(Fig. 3)r is substantially at the point where the high pressure valve||1 will vbe opened. Upon opening said valve by cam |0I, and closing ofthe discharge valve |25, the water under high pressure will enterchamber I2 from which it willbe conducted by a high pressure conduit |5|to one end of a cylinder |60 in which is'a piston IGI. The piston |6|connects by a rod |62 with an arm |63 on a valve |64 that is in the pulpsupply line 2|, 'Ihe movement of piston |6I under the influence of thehigh pressure Water causes valve |64 to open for permitting the fibrouspulp to enter the mold forms as soon as the piston I0 is suicientlyelevated to clear the pulp inlet slots I9.

The high pressure line I5| continues to the inlet at the lower end ofthe cylinder |I that is on the cylinder head and is admitted to'belowthe piston I2 in said cylinder. Thus, almost simultaneously with openingof valve |64, the elevator piston I2 is moved upwardly carrying pistonI0 with it by reason of chain I3.` This upward movement of the piston I0is suicient to clear slots I9 and the mold forms above the pressureplate 5 are lled with pulp.

The mold forms will be lled by the time the high surface on cam I0| ispassed, whereupon the high pressure valve will be closed and thedischarge valve opened. The valve |64 will then automatically closeunder the influence of spring |65 that is connected with the piston rod|62. The water in the cylinder |60 will be drained into the dischargechamber I|| and any Water that might pass the elevator piston I2 in thecylinder I I will drain into sump 96 at any time, while the water belowsaid piston will be free to drain into discharge chamber III until thedischarge valve |25 is closed again.

The next step is admitting water under high pressure into the cylinder 2above piston |0 so as to lower the piston I0 to a point where its lowerside is ush with the opposite edges of the mold forms 6|, 62, etc.,including hollow wall 15 Thus high pressure water will enter the elasticcores 26 causing them to expand for expressing the water from the moldforms and for compacting the fibers in the pulp against the form walls.

The admission of said water into cylinder 2 is accomplished by cam |02that opens conduit |52 to high pressure water. This high pressure wateris admitted into .cylinder |66 and piston |61 is moved by said water foropening valve |68 to pass high pressure water from supply pipe |69 intoline I1 that connects with inlet I1. As soon as the high point on cam|02 is passed, the valve |68 is closed under the influence of spring |10and the water in line |52 is drained into the discharge chamber III. Bythis time the containers of brous pulp have been formed, and as valve|68 is a two-way valve, its closing of communication between the highpressure line |69 and conduit I1 is succeeded immediately by an openingof the conduit I1 to discharge line I1| and the Water above piston I0 issiphoned into siphon tank |12, from which it is conducted through line|13 into sump |14. The vertical adjustment of discharge pipe |15 as tothe level of its upper end determines the degree of siphoning actionthrough line I1 I.

The siphoning of water from cylinder 2 results in collapse of cores 26so as to space them from the wall forms, and to facilitate this collapsewithout danger of injuring the containers through a vacuum action orsuction, air may be forceably ejected into the mold forms through theair lines |5 and tubes 28 (Figs. 6, 16), or the 10 sides fof %s'aidvalve above said: partition,` :and .ports 'f 203 rare insaid 'sidesbelow'thenpartition; ,The" upper-:endrof the valveopens into-chamber|849"` While the, lowerendnopens` through ports 204"intoz:

chamber* |85# Whenthenvalve is in vitslnormal'l inoperative'position;any-Water entering chamber I 8251s free= to ow through the valve vinto*chain` i bers: |84",vv I 85 ;.f:or iny the event valves |903 I 9 |17are open,.the highfpressurewater from inlet |88 maypressureswaterrandnthis'i conduit communicatesaelOffow intosaid-centrall chamber anal*y outfthroughfwith. oneaendy offra cylinder.lof saiddeviceoIf'Il-f; therebym'rging: piston: I:18amsaiclhylindenagainstt anzarm :|11 91that dependsrfromzthelo'ckinginingti 9.o (Figs r1, 112).'. Anladustable stopalmscmrsaidfi-cylindensstops:zrotation of theyrngnwhen itazfisn15`| fullyunlockedrz,vThewatervmathe:oppositecenare offthencylinder .I"|"|;- is: ,drainedithrough.line:i |1543?. intcnlthe.dischargezchamboh: I: by actionpo-fvicam r I Mithiessaid 'camsl I 83,51 0.4xbeing;,arnangediso-- theportA |83; ViaJlvesuIS,r |94 would; of 'course, beclosed.tofaccomplishthelatter; When valves I 90; I9I .are openthevalves=I93;-"I94fare closed;= andviceversa Thefrod |91 carrying.'`throttle Valve |96 has an annularly grooved collar 205 at its upper-end(Fig;f14)f"for engagement with the linwardlyvpro;` jecting pins 206 ftheforked end of a bell crankl 201.' This crankfspivotedl toa bracket-20'8'ffor" thatl -thlehighfsurfacef,zofwone'riopensathezconduit.L20y upand downrswingngiOffitsfforkedxendfand for y I 53,1tozhighipressurezwatemiwhil'e the. lomsurface n:

of cam I 04 opens conduit I54?todraining;and`

vicvelsakz'ff Y I Unomthealockingzring beingrunlocked;theapresef 1 omdescendsi-qucklyfofr itsrownfweightrat- The. lirre .l 98xftl'1at'iisS'atfthe slowenn-endsof theffrcylindenff'lis openedI totadischarge:jthronghf:4 an control Abox I8 I v; thatfscarries sa.'plurality fof :control valves therein (E1gs'f:1,l;4; llf,

Thefflirre 298 .f fromnth'ellowexmend :of cylinder r=`| entersfia'centralzzchamben I82;in'I saidlboxfrfllw througlfnandnLet-.L483JxAbovefchafmber.` ISZf-is a chamber: |84,"y and: below: Chambonl I 82iis `a cham;l 1

raising-the rod |91ifon thefupwardy movement thereof; The end of thecrank oppositeits forked end :Carr-iosa cam follower `1`20'!!`-fthatfjisy adapted to engage a cam y2|ll that -is connected-5 vWith'theL vertically reciprocable rpressure plate-5*' for movement therewith;1 Thel'br'aoket Y' 208\1is 'f stationaryy and is' secured t'othey mold'jacket' 3. *f

In operationyasthe Ipressure plate'thatsupports the .mold formsfduringythe upper' portion-of they movement,v the highL portion ofcam21`I0willer1'-` gage-the folloWerV/Zthuscausing the forked` end* of thecrank 291 to-swing upwardly.l 'f The throttle Valve Will accordingly beraised'soas:to-choke off A high-f pressure water line |88 communicates oatr :alleimesawith the? chamberv` 'I 86.; zwhile chamber-v This;at-falla'times ini-communication with.v sump.'- |14 fiori draininginto;saidnsumpcthroughfline |89,v I.' t

Thea-:top and bottomznwalls"vof-ichamber' IBS-fare" lnorteriiandafaresvr.provided .with valve's |99,12"| 9111..

ports'fZlBTand- 2045 Asfthe Water enteringcham:

berv |82' on the down strokeof `the pressureplateIv` comesY fromwthelowerend of the cylinder 'I in* Which'pStQmSTI ofsethefpressurecple/terama-'rodr-SF? `0gisereciprocalo-le, this chokingfoff of the WateroW-fthrough/#thek lthrottle ValVeiWill momentarily slowff The rod |95 thatcarries valves |9-3.f;s|94rcon.=f: tinuesf downwardlythroughthefbo-ttom'sof thecbox I8 I fandinto a cylinderzZ I 2.l ,i A-Episton' 2| 3 l"isi-sew cured to the lowerczend` ofzssaidrodWithinf-saidi;

The top and liottomywal-ls';ofxghamberqarare 5 .'ioccylind-en--andthelatter-is ported-topandbottoinf portedffsmilarnto :ftheixuppen vand-f;lower wal'lsl of chamber |85 Vand saideportsf tare` tpro-vident` withva'lnesat93;r :1| 94 that are,y secured;ronra rodfll SSI-foxsimultaneous@ operation: 'ito v .opens and@ :tor-f .closedi posilsiorm;`f

The valves |:9IIQ` I 911| omrod1|92 .fare Vadaptectt'o openfiontgthetdownzstrokef offrodi.l ISZQIWh-ile' the'f valvesol 9.3;; fI 941 are;adapted.E to'Y Open-ion the'` upstroke of the rod |95. v

abovey 'and below said piston sforcommunication'i With'conduits 2M,:ZIB: The line :2M communi:- cates with? theA chamberV in-hofusing 00thatlis.f similar-,tothe oneindicatedfatl H2 inig. :3, and?,

55:5 which chamber is under the control o'f-ca'molIlS? (Fig. l)Whilefline 2 Il|E communicates with' the chamber undercontrolofrcamvls'.ll're` pressure'plate'- 5` carries ra .pairrof arms 2 I5, -f2I:8:('Fig. 14) that are'ifforkedfatf'their 'outer ends:

Vertically reciprocabl throughthewupperand 60;; tofreceivethe rodIrbetvzeenthe-'forked end'JC-ff' arm 2I5"and theqrod ISZibetWeen the'forked-'endof arm'2sI8:' These armsfmov'e downwardiywithf thetpressureplate; and-at. abouty the `lower'cnd ofv 'its stroke the forked fend-ofarm 2I5zuvvlllA` saiddplate" commences-Mits -downs/ardi'fxnoVemem-if.A655i engage a collarA 2 I .'I secured onfsadf ycollarr nuova:y

The cam- VI 051that controls the'flow ofihighxprese-f, sure`Water-rthrough 'linel` 2 Iii tofJ below ther-pistoni ZUiIJsintermediatesits'iendse: PortsiiZUZoare ffl-n the: 751

1 l tends downwardly and outwardly of box |8| `into a cylinder 2| 8, anda piston 2|9 is secured to the lower end of said rod within saidcylinder.V A pipe lline 220 extends from the upper end of cylinder 2| 8to the chamber similar to ||2 that is controlled by cam |01, and a line22| extends from the lower end of said cylinder and below said piston tothe chamber controlled by cam |08.

AlmostI immediately after the valves |93, |94 are closed, the cam |08will cause high pressure water to Ilow into the lower end of cylinder2|8 and the cam l|01 will cause line 220 to be opened to discharge'intodischarge chamber of the control device |00. The valves |90, |9| willthen be simultaneously opened and high pressure water will pass intochambers |84, |85 and through valve |96 and out of chamber |82 into theconduit 98 that leads to the bottom of cylinder 1, whereupon thepressure plate 5 will rapidly be elevated toward mold closing position.

At this point it will be explained that the previous lowering of thepressure plate also resulted in the downward and lateral outwardmovement of the mold form walls 6i, 52,63, 64, 65, 61. Thesewalls,ihowever, did not fully follow the pressure plate during itsentire downward movement, but they only dropped the distance permittedby the slots 58 (Fig. 8), hence are suspended from the mold jacket readyfor being pushed upward and inward as soon as the pressure plate cover92 that is rigid with said pressure plate is elevated sufficiently toengage the lower ends of the hollow members carrying the form walls.

1 The slowing down of the descending pressure .plate at the point wherethe hollow members that carry the form walls leave the pressure plate,thereby eliminating the objectionable shock that the stopping of thehollow members would otherwise cause, has been mentioned. Upon theelevating of the pressure plate, this same slowing down occurs justbefore the plate engages the hollow members on the upstroke by reason ofthe cam 2|0 engaging follower 209 and again causing a rocking of thecrank 201 and raising of the throttle valve |96 to choke the fio-w ofliquid therethrough.

. Just before the pressure plate is at its highest point and is readyfor locking of the mold together for a new cycle, the forked end of arm2|6 will engage collar 225 that is secured on valve rod |92 thus closingvalves |90, |3| and at the same time cam |08 will open line 22| to highpressure Water and cam |01 will open line 220 to drain into thedischarge chamber of control device |00.

.During the `ettore-mentioned operations of the cams to |08 inclusive,the cam shaft |31 has practically made one revolution and cam |0| isabout ready to cause opening o-f line |0| to open valve |64 and toelevate piston l2. If the pressure plate is fully elevated and afractional turn of the locking ring 39 will lock the pressure plate tothe mold jacket 3, then the rotation of cams |02 and |03 for openingline |54 to high pressure water and for opening line |53 to dischargewill result in the piston 226 in the hydraulic device |16 moving the arm|19 in a, direction for rotating the locking ring and locking thepressure plate to the mold jacket. However, provision is made forrendering the entire apparatus inoperative should the pressure plate notbe fully elevated so that the locking ring will not rotate for lockingit to the mold jacket when said line |54 is opened.

The safe-ty means above mentioned comprises a.- high pressure line 230(Fig. 1) that has a needle valve or the like 23| therein for controllingthe flow of water therepast to a T fitting 232. One line 233 from said Ttting leads to one end of a cylinder 234 (Figs. 1, 4) while another line235 leads from said fitting to the upper end of a cylinder 236 (Fig. 1).The cylinder 236 is secured in any suitable manner to the mold. jacket 3and within said cylinder 236 below the point where line 236 enters thesame is a ball valve 231that is between said point and an outlet thatcommunicates with a line 238 leading to sump |14. A ball-lift-rod 239extends out of the lower end of cylinder 236. This rod is adapted to belifted for raising ball 231 from its seat by rocking of a crank that ispivoted at 240 on a bracket 24| carried by said cylinder 236. One arm242 of said crank engages said lower end of rod 239 and a counterweight243 balances said arm for maintaining said engagement, while the secondarm 244 of said crank depends therefrom and into the path of an arm 245projecting from the locking ring 39, (Figs. l, 11).

The cylinder 234 (Figs. 1, 4) has a piston 250 reciprocable therein, anda rod 25| secured to said piston projects from the end of the cylinderthat is opposite the high pressure line 233. A spring 252 reacts betweensaid piston and the head of the cylinder through which the pistony rodprojects for holding the outwardly projecting end of the rod retracted,but upon sufficient water pressure in the cylinder, the'piston will bemoved to project the end of the rod into the path of an angularprojection 253 on dog |42 so as to thro-w the dog out of recess |43 uponengage-` ment between the projection 253 and rod 25|.

When the ball valve 231 is closed (Fig. l), the pressure in the line 233and cylinder 234 will build up for projecting the rod 25| into the pathof the projection 253, but if the locking ring 39 is free to properlyrotate under the high pressure admitted by action of cam |04 into theend of the hydraulic device |16, then the arm 245 on the ring willstrike the arm 244 of the crank on bracket 24| thus lifting the ball 231and relieving the pressure in cylinder 234, whereupon the rod 25| willbe retractedout of the path of the projection 253 on dog |42 (Fig. 4),and the cycle of operation, starting with the admission of pulp into themold forms and the elevating of piston l0, will be automaticallyrrepeated.

The reas-on for mounting the central hollow wall 15 of the mold form sothat it will rise under the influence of spring 8| as soon as thepressure plate descends, is to insure freeing the container from saidhollow wall The containers 'can readily be lifted from the bottoms -ofthe mold forms without injury, but there is a likelihood that anysticking to the side and bottom of the form might cause difficulty.

A machine for making the covers for the containers would differ from theone described in minor details. Fig. 2 illustrates such differences, itbeing seen that the mold jacket 260 need not be so deep vertically, andthe bottom wall 26| may be made in different heights so as to form ashallow or deep cover as may be desired. Also, the elastic core 26-2 ofthe device may .be stationary, thus simplifying the machine. O-f course,relatively shallow containers may be made by the machinev of Fig. 2.

It is to be understood that the ascending and descending pressure plate5, locking ring 33, controls for the pressure plate hydraulic system andfor the admission of pulp into the mold form, as well 35 the admissionof high pressure water cable hydraulically actuated piston coaxial withsaid ram and spaced above said platform, a plurality of adjacent pairsof perforated side walls between said piston and said platform formingthe side walls of a plurality of mold forms for a plurality ofcontainers, expansible water-impervious cores carried by said pistonpositioned for extending into each of said forms, means for tightlylocking said piston, platform and side walls together, means foradmitting said pulpy material into said mold forms when the latter areso locked together, means for admitting liquid under pressure into saidcores after said pulpy material is admitted into said forms forexpanding said cores and for compacting said bers against said platformand side walls to for-m the sides and bottoms of containers, and meansfor releasing said platform and mold forms from said piston and fromeach other after said fibers have been so compacted for rem-oval of thecontainers formed by the compacted fibers, said last mentioned meansincluding a housing enclosing said piston and said side walls and alocking member carried by said platform -movable into and out of lockingengagement with said housing at the top of the movement of said ram.

7. A machine for molding containers from pulpy fibrous materialcomprising a perforated platform provided with an upstanding hollow wallhaving perforated sides, a plurality of vertical perforated side wallsat opposite sides of said hollow wall arranged to coact with said sidesfor forming rectangular sided mold forms at opposite sides of saidhollow wall with said sides of the hollow wall forming one of the sidesof each such form, said side walls being separable from said platforman-d supported thereon when said side walls are together with saidhollow wall for forming said forms, means supporting said platform forvertical reciprooation, means for carrying said side walls away fromeach other and away from said hollow wall during downward movement ofsaid platform, means for moving said hollow wall relative tosaidplatform and side walls during said downward movement, and meanssupporting said hollow wall for said movement.

8. A machine for molding containers from pulpy fibrous materialcomprising a perforated platform provided with an upstanding, hollowwall having perforated sides, a plurality of vertical perforated sidewalls at opposite sides of said hollow wall arranged to coact with saidsides for forming rectangular sided mold forms at opposite sides of saidhollow wall with said sides of the hollow wall forming one of the sidesof each such form, said side walls being separable from said platformand supported thereon when said side walls are together with said hollowwall for forming said forms, means supporting said platform for verticalreciprocation, means for carrying said side walls away from each otherand away from said hollow wall during downward movement of saidplatform, means for moving said hollow wall relative to said platformand side walls during said downward movement, and means supporting saidhollow wall for said movement, said last-mentioned means being connectedwith said platform for reciprocable movement therewith.

y9. A machine for molding containers from pulpy brous materialcomprising a perforated platform provided with an upstanding, hollowwall having perforated sides, a plurality of vertical perforated sidewalls at'opposite sides of said hollow wall arranged to ooact with saidsides for ormingmectangular sided-@mold forms atI opposite sides ofsaidhollow wallwithv said sides of -the hollow wall forming one of thesides of each such form, said side wall being separable from saidplatform and supported thereon when said side walls are together withsaid hollow wall for forming said forms, means supporting said platformfor vertical reciprocation, means for carrying said side walls away fromeach other and away from said hollow wall during downward movement ofsaid platform, means for moving said hollow wall relative to saidplatform and side walls during said downward movement, andmeans-supporting said hollow wall for said movement, the said means forcarrying saidside walls being separate from said platform, and saidplatform being movable on its downward stroke entirely clear of saidside walls to a level a substantial distance below the lower edgesthereof. r

10. A machine for molding containers from pulpy brous materialcomprising a perforated platform provided with an upstanding hollow wallhaving perforated sides, a plurality of vertical perforated side wallsat opposite sides of said hollow wall arranged to coact with said sidesfor forming rectangular sided mold forms at opposite sides of saidhollow wall with said sides of the hollow wall forming one of the sidesof each such form, said side walls being separable from said platformand supported thereon when said side walls are together with said hollowwall for forming said forms, means vsupporting said platform `forvertical reciprocation, means for carrying said side walls away fromeach other and away from said hollow wall during downward movement ofsaid platform, means for moving said hollow wall relative to saidplatform and side walls during said downward movement, and meanssupporting said hollow wall for said movement, means for admitting saidmaterial into said forms and for compacting the fibers against the wallsthereof, and means for rendering said pulp admitting means .inoperativeuntil said side walls and hollow wall and platform are tightly togetherfor forming said forms.

11. Apparatus for molding containers from pulpy fibrous materialscomprising, a mold form having separable perforated. side walls and abottom wall, means for admitting said material into said form, anexpansible and contractable core within said form and separable from thelatter for compacting the fibers in said material against said sidewalls and said bottom wall and for expressing moisture therefrom, meanssupporting said side walls for relative movement away from each otherand from said bottom wall and core, means for so moving said side walls,releasable locking means for positively locking said side walls togetherand to said bottom wall during admission of pulp into said form andduring expansion of said core, means actuated by said locking means forrendering said pulp admitting means and said core expanding meansinoperable when said locking meansis released.

12. Apparatus for molding containers from pulpy fibrousmaterialcomprising, a mold form having separable perforated side walls and abottom wall, means for admitting said material into said form, anexpansible and contractable core within said form and separable from thelatter for compacting the fibers in said material against said sidewalls and said bottom wall and for expressing moisture therefrom, meanssupporting said side walls for relative movement away from each otherand from said bottom wall and core, means for so moving said side walls,releasable locking means for positively locking said side walls togetherand to said bottom wall during admission of pulp into said form andduring expansion of said core, means actuated by said locking means forrendering said pulp admitting means and said core expanding meansinoperable when said locking means is released, said pulp admittingmeans, core, side wall supporting means and locking means beinghydraulically actuated and a main control means including a highpressure uid inlet and valved outlet conduits extending to said severalmeans for causing actuation of said several means in a predeterminedorder, a motor for actuating said control means.

13. Apparatus for molding containers from pulpy nbrous materialscomprising, a mold form having separable perforated side walls and abottom wall, means for admitting said material into said form, anexpansible and contractable core within said form and separable from thelatter for compacting the fibers in said material against said sidewalls and said bottom wall and for expressing moisture therefrom, meanssupporting said side walls for relative movement away from each otherand from said bottom wall and core, means for so moving said side walls,releasable locking means for positively locking said side Walls togetherand to said bottom wall during admission of pulp into said form andduring expansion of said core, means actuated by said locking means forrendering said pulp admitting means and said core expanding meansinoperable when said locking means is released, said pulp admittingmeans, core, side wall supporting means and locking means being fluidactuated, and a plurality of cam actuated valves for controlling thefluid that actuates said several means so that the actuation of saidseveral means will be in a predetermined order and for predeterminedperiods of time.

HARVEY R. DENTON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 398,397 Howard Feb. 26, 1889954,962 Homburg Apr. 12, 1910 958,019 Shackleton May 17, 1910 FOREIGNPATENTS Number Country Date 586,156 Germany Oct. 26, 1933

